Getting ready for Spartan 228/232 cam swap, graph attached...
10-23-2010, 08:28 PM
#61
As a tidbit of info......I checked PTV today. The heads are 799 with a cleanup mill only. I read you want at least .100 on the exhaust and .080 on the intake, as a general rule. I came up with around .120 on the exhaust and .105 on the intake. I think these heads could safely take a .020 mill with acceptable clearance with this cam in the .612 lift version.
10-25-2010, 10:45 PM
#63
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Sorry, kind of forgot to update this thread. 
I'm taking it back into him Thursday & he's gonna work on the issues, so I'll be sure to post back.
Hey, I'm curious if you take you car to the track? If so, what's your race weight & what kind of #'s do you run, 60', 1/4 mile, & trap speeds?
I'm taking it back into him Thursday & he's gonna work on the issues, so I'll be sure to post back.Hey, I'm curious if you take you car to the track? If so, what's your race weight & what kind of #'s do you run, 60', 1/4 mile, & trap speeds?
Last edited by osuhog; 10-26-2010 at 08:00 AM.
10-26-2010, 09:05 AM
#64
Sorry, kind of forgot to update this thread. I'm taking it back into him Thursday & he's gonna work on the issues, so I'll be sure to post back.
10-26-2010, 09:34 AM
#65
I am pretty sure he worked my maf tables, before his tune I was peaking 34-36, now it peaks 39-42.
My car's race weight is somewhere above 3700. It weighs 3820 with me, 7/8 tank, all my **** in the trunk...at the track I run less fuel, remove tools, remove 40lb sub box.
I have only ran 1/8th mile. My bests so far in 2800+ DA:
60 ft 1.78 (still spinning some)
1/8th mile 7.85 (I let out for a bracket race)
mph 89 average (might have been faster on my 7.85 pass but I let out hard)
before his tune/ underdrive pulley in 2400 DA
60 ft 1.79 (spinning some)
1/8th mile 7.9
87.5 mph
My car's race weight is somewhere above 3700. It weighs 3820 with me, 7/8 tank, all my **** in the trunk...at the track I run less fuel, remove tools, remove 40lb sub box.
I have only ran 1/8th mile. My bests so far in 2800+ DA:
60 ft 1.78 (still spinning some)
1/8th mile 7.85 (I let out for a bracket race)
mph 89 average (might have been faster on my 7.85 pass but I let out hard)
before his tune/ underdrive pulley in 2400 DA
60 ft 1.79 (spinning some)
1/8th mile 7.9
87.5 mph
10-28-2010, 08:24 PM
#66
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Okay, after making the 3 hour round trip drive with 2 cars yesterday to drop off my TA (so he'd have it cold to tune on today), then another 3 hour round trip today to pick it up after work, I think it's actually worse than it was before.
Here's a video I took just now, right as I pulled into my garage after making the 90 minute trip home, so it is obviously completely warmed up. It almost died as I backed into the garage. Then I put it in park & it stumbled again trying to find idle. So, I got out my cell phone & took a quick shot of the tach as I tapped the gas pedal a few times while in park. Again, this is completely warmed up. It's much worse when it's cold.
http://www.youtube.com/watch?v=hAxg2GuaN70
Here's a video I took just now, right as I pulled into my garage after making the 90 minute trip home, so it is obviously completely warmed up. It almost died as I backed into the garage. Then I put it in park & it stumbled again trying to find idle. So, I got out my cell phone & took a quick shot of the tach as I tapped the gas pedal a few times while in park. Again, this is completely warmed up. It's much worse when it's cold.
http://www.youtube.com/watch?v=hAxg2GuaN70
10-29-2010, 10:53 AM
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Thanks for the suggestion. I bought brand new IAC & TPS when I did the P&P TB 6 or 8 weeks ago, plus the idle was perfect before the cam swap/tune, so I would think I'm good to go with that stuff.
11-02-2010, 12:39 PM
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Just posted this in the PCM section for some input, but thought I would update this thread with it too. I just purchased HP Tuners & pulled my tune off.
Is it weird to anybody else that he tuned my car on a Speed Density OS for a MAF tune? Also, is this gonna cost me more credits to convert back over to a MAF OS if I don't go back & have him convert it back for me?
Is it weird to anybody else that he tuned my car on a Speed Density OS for a MAF tune? Also, is this gonna cost me more credits to convert back over to a MAF OS if I don't go back & have him convert it back for me?
11-02-2010, 01:58 PM
#73
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Slight problem with my dyno tune last week because my pushrods were too long (too much preload, not building compression). Got the new shorter pushrods installed tonight & took my first drive. Everything sounds great & my next dyno appt. is next Thursday morning, so I will be sure to update this thread Thursday night. Sorry for the suspense, it's killing me too. Wish I could take it back tomorrow!
11-02-2010, 02:19 PM
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I bought my car from a Dr. who had owned it since new. Everything was bone stock, right down to the lid, air, egr, etc. I started with bolt-on's as soon as I bought the car. As I starting modding, it seemed very obvious to me that nobody had ever taken a bolt off the engine.
So, that said, it still has the stock 853 heads & LS1 lifters. At least I'm 99% sure it does. I originally went with 7.425" pushrods. When I took them back out after my issues & measured several different ways, they all put me at about .125 preload, which was hanging my valves open & not building compression to gain any power. So, I went with 7.375" pushrods for .075 preload & everything has been great since.
So, mine appears to be a real anomoly needing the shorter than 7.4" pushrods after a cam-only swap. BTW, my stock pushrods were 7.385", FYI.
So, that said, it still has the stock 853 heads & LS1 lifters. At least I'm 99% sure it does. I originally went with 7.425" pushrods. When I took them back out after my issues & measured several different ways, they all put me at about .125 preload, which was hanging my valves open & not building compression to gain any power. So, I went with 7.375" pushrods for .075 preload & everything has been great since.
So, mine appears to be a real anomoly needing the shorter than 7.4" pushrods after a cam-only swap. BTW, my stock pushrods were 7.385", FYI.
11-02-2010, 02:37 PM
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11-02-2010, 02:45 PM
#78
Let me know how he handles it either here or PM
I have been recommending others to him and do not wish to continue doing so if he won't help customers after the fact. Personally my experiences were all very positive and he went out of his way to help me after my driveshaft destroyed my trans on his dyno.
I have been recommending others to him and do not wish to continue doing so if he won't help customers after the fact. Personally my experiences were all very positive and he went out of his way to help me after my driveshaft destroyed my trans on his dyno.
11-03-2010, 09:26 PM
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Poking around in HPT I decided to record some data. So, I just went out & went WOT out on the highway to see what I could see, especially injector duty cycle.
I'm guessing 121% duty cycle at 6277 RPM's is a bad thing.
I asked my tuner MULTIPLE times what my duty cycle was & the only answer he ever gave me was "it's fine". I know, I know, fire your tuner! Already did that, just trying to figure out what my next step needs to be. I'm guessing maybe some SVO red top's?
Also, any chance my car was missing out on some power on the dyno from this duty cycle on the injectors?
I'm guessing 121% duty cycle at 6277 RPM's is a bad thing.
I asked my tuner MULTIPLE times what my duty cycle was & the only answer he ever gave me was "it's fine". I know, I know, fire your tuner!
Already did that, just trying to figure out what my next step needs to be. I'm guessing maybe some SVO red top's?Also, any chance my car was missing out on some power on the dyno from this duty cycle on the injectors?
Last edited by osuhog; 11-03-2010 at 10:20 PM.